. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . about 1,000 tons. In connection with the manufacturei>f these cables, a foot-note appendedl)y the editor of Mr. Roeblingsmemoir on the bridge, published byJohn Weal, London, 1856, says: It isan important fact that iron of a suitablequality for wire is increased in strengthor tensile power nearly threefold bybeing drawn into wire. Thus, a rodof iron capable of sustaining, say, 30cwts., when drawn into wire of onlyone-third its sectional area, or, what isthe same thing, into three times thel
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . about 1,000 tons. In connection with the manufacturei>f these cables, a foot-note appendedl)y the editor of Mr. Roeblingsmemoir on the bridge, published byJohn Weal, London, 1856, says: It isan important fact that iron of a suitablequality for wire is increased in strengthor tensile power nearly threefold bybeing drawn into wire. Thus, a rodof iron capable of sustaining, say, 30cwts., when drawn into wire of onlyone-third its sectional area, or, what isthe same thing, into three times thelength of the rod, will still sustain30 cwts. The deflection of the cables, or, aswe would say, the sag of the uppercables, at medium temperature, was 54ft., and that of the lower cables was64 ft. The effect of heat and coldupon the cables caused their contrac-tion and extension, and the calculateddifiference in level of the bridge floorcorresponding to a change of 100 de-grees in temperature was 2 ft. 3 ins. inthe centre, and this was found to agreeclosely with tlie results of actualobservation. I. METHOD OF ANCHOKING NIAG(From of Niagara Falls Bridge, to bring to light in the study of variouscurves. A catenary has a lower centreof gravity than any other curve hangingfrom the same points of support. The railway suspension bridge overthe Niagara gorge was, as we havesaid, opened for traffic in 1855. It hassince been replaced by the steel arch,which we illustrated in our article onarched structures in the December,1906, issue of R.\iLWAY ,d Locomo-tive Engineering. The suspensionbridge was used until 1897, a period offorty-two years. It was 821 ft. 4 ins. ARA SUSPENSION BRIDGE CABLES,published by John Weale, London, 1856.) The bridge structure itself was inthe form of a hollow box, 24 ft. wideby 20 ft. deep, made with solid girders5 ft. deep, trussed so as to effectivelyresist the action of any gale. In addition, there were 56 wire-rope staysintended to resist wind press
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